Hey... neat game!

Hmm... maybe if you had a one time use weapon or something that you could toss up in the air to 'blast' a bunch of falling rocks or something too.

Also maybe some running shoes or something to increase the speed of your guy below.

Maybe a special bonus game/round can be played if you collect a set of dimonds or instead 'gems' that spell a word or something. Then the game will pause for a bonus round where you play a different kind of challange or something? Could spice things up a bit...

The bonus game could be inside a cave where you are in a mine cart dodging rocks or something...

Just to give you more to do than just dodge the rocks. Like little goals to complete. Maybe collect a special item to proceed to the next level. Shovel, blast caps, helmet, boots, etc...